Pattern-vibrator for molders.



H. -L. WALKER. PATTERN VIBHATOR FOR MOLDERS.

APPLICATION FILED DEC.3I. I9I7- Patented May 21,1918.

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IATTERN-VIBRATOR FOR MOLDERS.

Specification of Letters Patent.

Patented May 21, 1918.

Application filed December 31, 1917. Serial No. 209,787.

'1 0 all whom it may concern:

Be it known that I, I-IUGI-I L. WALKER, a subject of His Majesty KingGeorge V of Great Britain, residing at the city of Guelph, in theProvince of Ontario, Dominion of Canada, have invented a certain new orImproved Pattern-Vibrator for Molders, of which the following is aspecification.

The object of my invention is to provide an eflicient, cheap and simplevibrator for shaking a molding pattern so as to free it from anyadhering particles of sand before lifting the pattern from the mold.

I attain this result by means of the apparatus illustrated in theaccompanying drawings in which:

Figure I is a front view of one form of my new or improved patternvibrator containing all the essentialfeatures of my invention.

Fig. II is another form of same with partially inclosed controllingsprings.

Fig. III is a top view of Fig. II showing the partially inclosedcontrolling springs in operating position.

Fig. IV is a rear view of the ratchet wheel arrangement shown in Fig. I.

Fig. V is a similar view of the ratchet wheel arrangement in Fig. II,while Fig. VI is a side view of the apparatus illustrated in Fig. I.

Similar letters of reference indicate similar parts in all the drawings.

My invention consists essentially of the central stem A, the upper partof which (a) forms a handle for holding the apparatus in position, andthe lower end of which (a) is tapered so as to fit into the gate hole inthe pattern which it is shaking; and one or more vibrating arms B. B.hinged at the top on opposite sides of the central stem A, andcontrolled by spiral springs (c) said vibrating arms B. B. beingoperated by means of staggered ratchet wheels C O mounted on the backand front respectively of the central stem A and operated by means ofthe crank arm I), said ratchet wheels bearing against projections (b)(6') mounted on the vibrator arms B. B. or working in recesses (0) asshown in Figs. I and IV.

The bridge or link E attached to the central stem A serves to guide thevibrator arms B. B. and also to carry the controlling springs (c).

As will readily be seen the revolution of the ratchet wheels C Cf bymeans of the crank handle 'D, will alternately press out the vibratorarms B. B. thus compressing the controlling springs (e), and when theteeth of the ratchet wheels have passed the projections (Z1) (6) thevibrator arms B.B.wil1 be forcibly driven in by means of the controllingsprings (6) and striking the central stem A, forcible blows alternatelyon either side, will serve to vibrate the same, and consequently thepattern into which the tapered lower end of the stem ((1') fits.

I claim:

1. A pattern vibrator for molders, com prising in combination a centralstem formed into a handle at its upper end and tapered to a point at itslower end, provided with one or more hinged vibrator arms, ratchetWheels for operating same; said vibrator arms being adapted to forciblystrike the central stem thus vibrating the same and consequently thepattern into which it is inserted, substantially as hereinbeforedescribed.

2. In combination with the central stem and hinged vibrator arms of apattern vibrator; one or more ratchet wheels operated by means of acrank handle the teeth of said ratchet wheels being adapted toalternately press out and release said vibrator arms, substantially ashereinbefore described.

3. In combination with a pattern vibrator composed of a central stem andone or more vibrator arms, ratchet wheels for operating same, saidratchet wheels being mounted on the central stem of the vibrator; spiralsprings bearing on and forcibly compressing the vibrator arms for thepurpose of driving them forcibly against the central stem of thevibrator when released by the passing of the teeth of the said ratchetwheels, substantially as hereinbefore dmcribed.

HUGH L. WALKER.

Witnesses:

J. W. ALDnRsoN, A. L. MCFADGEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner ofI'atents, Washington, D. G.

